Vat dye.



' formula:

UNITED STATES PATENT oi rrca.

NEAR ELBEBFELD, GERMANY, 'AssrGNoR TO FARBENFABRIKEN VOR-M. FRIEDR. .BAYER '80 CO., OF ELBERFELID, GERMANY,

A CORPORATION OF GERMANY.

Specification of Letters Patent.

VAT DYE;

Patented June 4, 1912.

No Drawing. Originalapplication filed February 28, 1911, Serial No. 611,361. Divided and this applicaitan filed September 6, 1911. Serial 110,647,947.

invented new and useful Improvements in Vat Dye, of which the following is a specification. v

My invention relates to the manufacture and production of new vat dyestuffs of the anthraquinone series, and this application is a divisional application of my pending ap-' plication- Ser. No. 611361 filed Feb. 28; 1911,

i in which I described the corresponding single condensation by means of monomercaptans.

The process for their production consists in condensing by means of sulfuric acid an thraquinone dimercaptans with 2 molecules of oxyanthraquinones or vdioxyanthraquinones with 2 molecules of anthraquinone mercaptans.

' The new dyes having most probably the I s s A/ \A \A \O/ 0/ I (A meaning an anthraquinone radical) are after being dried and pulverized reddish to brown powders soluble in concentrated sul-' furic acid generally with from a green to 7 greenish-blue coloration; dyeing cotton from an alkaline hydrosulfite brown shades.

vat from red to In order to illustrate the new processmore fully the following example is given,' the.

parts being by weight :3 parts of anthraquinone-L5-dimercaptan and 8 parts of alpha oxyanthraquinone are heated to 160- 170 C. with 100 parts of a 98 percent. sulfuric acid until the melt has assumed a green coloration and .the quantity of the dyestuff formed does no longer increase. A The melt is diluted with 1000 arts of water;

"the dye is filtered off and boiled with. dilute caustic soda lye. It can be purified by treating it with amalkaline solution of sodium hypochlorite, It forms a reddish-brown powder soluble in boiling naphthalene with a brown-orange coloration and in concentrated sulfuric acid with a green coloration. It dyes cotton from an alkaline hydrosulfite vat brown shades, turning Bordeaux red by rinsing and soaping.

. The dye has most probably the formula:

Other oxyanthraquinones can be used c. g 2 oxyanthraqumone, dloxyanthraqumones e. g. anthrarufin, anthraflavinic acld, or on using other anthraquinone climercaptans. 2 mols. of monomercaptans can also be condensed with a dioxyanthraquinone.

I claim 1. The herein described new vat dyes having most probably the formula s s A/ \A// l \O/ \O,/ A meaning an ant-liraquinone radical which dyes are "after being dried and pulverized reddish to brown powders soluble in concentrated sulfuric acid generally with from a green to greenish-blue coloration; dyeing cotton from an alkaline hydrosulfite vat from red to brown shades, substantially as described.

2. The hereindescribed new vat die hav ing mos't' probably the formula:

. 1 1) o v \-co which forms reddish-Brown powder solumy hand in the presence of two subscribing ble 1n bolhng naphthalene wlth a brown- Witnesses.

orange coloration, and dyeing cotton from a PAUL THOMASO'H-E'WSKI. [L- s.] hydrosulfite vat Bordeaux-red shades, sub- VVit-nesses: 5 stantially as described. L. NUFER,

In testimony whereof I have hereunto set ALBERT F. NUFER.

Copies of this patent may be obtained for five cents each; by addressing the Commissioner of Patents,'

' Washington, D. 0 

